Borrowing Facilities and Debt (Debt Outstanding) (Details) - USD ($) $ in Millions	Oct. 25, 2015	Sep. 30, 2015	Oct. 26, 2014
Short-term debt:
Total short-term debt	$ 1,200		$ 0
Long-term debt:
Principal amount	3,350		1,950
Long-term Debt	3,342		1,947
Total debt	4,542		1,947
Senior Notes | 2.650% Senior Notes Due 2016
Short-term debt:
Short-term debt	400		0
Other debt
Short-term debt:
Other debt	$ 800		0
Other debt | Minimum
Long-term debt:
Effective Interest Rate	1.00%
Other debt | Maximum
Long-term debt:
Effective Interest Rate	1.25%
Senior Notes
Long-term debt:
Principal amount		$ 1,800	1,950
Total unamortized discount	$ (8)		(3)
Senior Notes | 2.650% Senior Notes Due 2016
Long-term debt:
Principal amount	$ 0		$ 400
Effective Interest Rate	2.666%		2.666%
Stated interest rate	2.65%		2.65%
Senior Notes | 7.125% Senior Notes Due 2017
Long-term debt:
Principal amount	$ 200		$ 200
Effective Interest Rate	7.19%		7.19%
Stated interest rate	7.125%		7.125%
Senior Notes | 2.625% Senior Notes Due 2020
Long-term debt:
Principal amount	$ 600		$ 0
Effective Interest Rate	2.64%
Stated interest rate	2.65%
Senior Notes | 4.300% Senior Notes Due 2021
Long-term debt:
Principal amount	$ 750		$ 750
Effective Interest Rate	4.326%		4.326%
Stated interest rate	4.30%		4.30%
Senior Notes | 3.900% Senior Notes Due 2025
Long-term debt:
Principal amount	$ 700		$ 0
Effective Interest Rate	3.944%
Stated interest rate	3.90%
Senior Notes | 5.100% Senior Notes Due 2035
Long-term debt:
Principal amount	$ 500		0
Effective Interest Rate	5.127%
Stated interest rate	5.10%
Senior Notes | 5.850% Senior Notes Due 2041
Long-term debt:
Principal amount	$ 600		$ 600
Effective Interest Rate	5.879%		5.879%
Stated interest rate	5.85%		5.85%